The demographic record they produced in the 20th century is without parallel in the scientific literature. A TFR approaching 10, a median completed family size of 10.4, a population in which 61% of members were under 20 years old — these are not figures from a pre-industrial society but from mid-century North America. Eaton and Mayer’s 1953 study did not just document a community; it established the biological ceiling against which all subsequent fertility research is measured. When demographers speak of “natural fertility” they mean, in practice, Hutterite fertility.
当成本涨幅超出内部优化极限时，涨价成为唯一选择。
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年初，B站第八届百大UP主名单出炉，这份被视为B站内容风向标的名单，释放出几个意味深长的信号。
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Российские банки начнут проверять лимит карт у клиентов02:57
Лига чемпионов|1/8 финала. 1-й матч，这一点在超级权重中也有详细论述